Selector



I Feb. 28, 1939. D. L. LIENZEN SELECTOR Filed Feb. 2, 1937 IBO PatentedFeb. 28, 1939 UNITED STATES PATENT foreros SELECTOR Application February2, 11937, Serial No. `123,732 In Sweden February 55, 19.36

6 Claims.

My invention relates to selectors for automatic telephone systems or thelike. In such selectors each group or frame in the selector multiple isusually provided with a separate conductor for marking `the group huntedfor. Said arrangement involves certain inconveniences consisting, forinstance, therein that the wipers of the selector, when Yhunting for acertain conductor in the multiple, must be advanced an extra step beforethe subscribers multiple proper can be reached. The invention has forits object to eliminate said inconveniences .and consists substantiallytherein that the driving mechanism for effecting the first settingmovement is in such a driving .Connection with a further set of Wipersadapted to be set in one direction, that during the first settingmovement of the selector the latter wiper set moves over a bank ofcontacts associated therewith. Since the conductors provided for huntingup the desired group are brought together to forma special groupmultiple, the latter can be made in the same manner r as the subscribersmultiples or frames, thereby smplying the manufacture. The wipers forthe group multiple are of the same construction as the Wipers for thesubscribers or line multiple.

The invention will now be described more in detail with reference to theaccompanying drawing which illustrates the invention as applied in aselector having movements in two directions which are perpendicular toeach other, and in which the subscribers multiple consists of blankwires.

Fig. l. is a perspective View showing an embodiment of the invention inaxially set position. Fig. `2 is a detail of the arrangement accordingto Fig. l.

Referring to the drawing, the reference numeral I designates a baseplate on which a shaft 2 is journalled in bearing brackets 3 and 4. Theshaft 2 serves as an axial slide for a tube 5 thread thereonto, saidtube being provided at one end with axially extending teeth 6 providedwith transverse slots forming peripheral teeth l.

The tube is axially displaceable under conn trol of an eletromagnet 8having an armature 9 connected with a driving pawl It which uponenergization of the magnet rotates a stepping Wheel II and a gear wheelI2 coupled therewith, said latter Wheel being in engagement with thetransverse slots or teeth I of the tube 5.

The tube 5 is rotatable under control of an electromagnet I3 thearmature I4 of which, on energization of the magnet, engages the teeth 6by means of a driving pawl I5 so as to rotate the tube. When the magnets9 and I3 are deenerg-ized the driving pawls 1I!) and I5 are `in knownmanner .drawn out of lengagement `with the stepping ywheel irl and theteeth 6 respectively. For retaining the ltube 5 in the set axialposition and 5 in the set rotary position there are provided springactuated 4holding detents I6 and Il which engage the stepping wheel IIand the teeth 6 respectively. `Secured tothe tube 5 is a coupling pinfiS which engages li-n an axial slot I9 on the 10 shaft 2, so that .theshaft wil-l always follow 'the Ytube 5 during the rotary movement of thelatter. .0n .one of the bearing brackets 3 is arranged a lspring housing-for a Vspiral spring ZfI wh-ich at one end fis secured to the springhousing and 15 at the other end to the shaft 2. The spring 2| istensioned when the electromagnet I3 rotates turbe 5 by ymeans of theteeth 6.

Under lthe gear wheel `I2 (see Figure 2) is arranged a gear wheel 23provided with a seat for 20 a helical spring 22. The function of thegear wheel 23 will v.be explained below. The stepping wheel i-I formstogether with the gear wheels I2 and 23 Va unit in which one end of thespring 22 is secured. The other end of the spring 22 25V is secured inan adjusting Washer 24 which by means of a screw 25 can be locked in anydesired position after the spring has been tensioned. The unit II, I2,23 is journalled on a pivot 26 secured to the base plate I.

At the end remote from the teeth 6 the tube 5 is provided with gearwheels 21 xed onto hubs 2t which are rigidly secured on the tube 5 andact as coupling members for the wiper mounti-ngs or holders causing thelatter to always fol- 'low the tube 5 during the axial displacement ofthe latter. The gear wheels 27 are in engagement with teeth 25 on thewiper holder 30 which carries two pairs of wipers 3|, 32 for makingcontacts with certain conductors in a multiple 40 33, 34. For restoringthe wipers 3I, 32 after displacement in an axial and in a radialdirection in res ect to the shaft 2 there is provided an electromagnet35 the armature 36 or" which, on energization of the electromagnet,actuates the detents I6 and I 'i respectively by means of arms 3'! and38 so that said detents are moved out of engagement with the teeth S andthe stepping wheel I I respectively. The shaft 2 is then initiallyturned back by the spring 2l, the tube 5 50 being then rotated restoringthe wiper holder 3Q together with the wipers 3I, 32 the latter breakingthe contacts with the wires of the multiple, whereupon the spring 22,see Fig. 2, turns back the gear wheel I2 which then moves the tube 5 65axially on the shaft 2 back to its original position, whereby the wipermounting and the wipers are brought back to their starting positions.

After they have left the multiple the wipers 3l, 32 in each pair areheld apart by insulated pins 6i, 62 supported by a light holder 63 whichis journalled on the tube 5 and follows the axial movement of the latteronly.

On the base plate I there is displaceably arranged a wiper holder 39provided with a rack 4i) which is in engagement with the gear wheel 23.

The wiper holder 39 carries a pair of wipers 4| Y which cooperate with agroup of contacts 12. Evidently said wiper holder moves only when theelectromagnet 8 Voperates for effecting an axial displacement of thewiper holder and when the tube 5 is restored axially, and consequentlyi-t serves to hunt for the wire or wires in the group of contacts 32which correspond to a certain Vgroup of lines in the multiple proper.

For controlling the starting positions and the extreme positions in bothdirections of selector movement there are provided a number of switchesfor the electrical connections. One switch 3d is actuable by a bar d5provided with an elongate-d slot i6 through which a screw i? is screwedinto the base plate l so that the bar can move axially. Said bar isprovided with a pair of turned-up portions t8, i9 positioned in the pathof movement of the holder 63 and actuated by the latter during its axialmovement. There is also provided on the bar an insulated pin 5D which onaxial movement of the bar actuates the contact springs in the switchlili for changing the circuits.

Reference numeral 5l designates a switch which is also divided into twogroups, one for the initial part ofthe rotary movement of the shaft 2and one for the final movement thereof. On the shaft 2 are positionedtwo insulating washers 52 and 53 which are adjustable individually sothat they can be adjusted to actuate the appertaining contact springgroup at the right moment.

For the operation of automatic switching members of the above indicatedkind there are required, as is well known, a number' of relays thecircuits of which can be connected to the driving magnets or restoringmagnets respectively of the selector in a number of diiferent waysdepending upon the particular duty of the selector in the automaticswitching system.

For eiecting the connections to the pair of wipers 3l, 32 there isprovided a cord 5d having four insulated conductors which follow thewiper holder 3B both during its-axial and radial movements.

For connecting to the pair of wipers di there is provided a cord havingtwo insulated conductors which follow the wiper holder 3Q during theingoing and outgoing movements of the latter.

In the drawing the multiple 33, 3d is shown as a i-wire multiple but itcan, of course, be built both with a greater and with a smaller numberof conductors. The group 33 contains l0() a-wires and 100 Zi-wires fortalking connections, and the group 3l?. contains the same number oftesting and call metering wires, in this specication called candd-wires. The wires of the multiple are held together by insulatingdisks, 22 wires being provided in each layer. Such a layer contains 10aand b-lines or 10cand d-lines. The two remaining wires in each layerare usually used for markings of various kinds.

It is of course also possible to displace the wiper holder 39 in thedirection of the first setting movement of the rod 5. In this case,however, the distance between the wires of the group multiple must beequal to the distance between the rows of wires in the subscribersmultiples.

In case, as shown on the drawing, the wiper holder carries pairs ofwipers which are to be connected simultaneously each to a blankconductor in the multiple, the wipers are so arranged that in eachcontact position they embrace two wires which are positioned side byside.

Except for the contact surfaces the wipers are cast into an elasticinsulating mass.

In the drawing I have illustrated only one embodiment of the inventionbut I do not, of course, wish to be limited to the construction shownbut all such changes and modications are contemplated as come within thescope of the Yclaims appended hereto.

I claim: Y

l. A selector arrangement comprising a set of stationary contacts, amovable set of wipers cooperating with said stationary contacts andcapable of performing setting movements in two perpendicular directions,a driving mechanism for effecting the rst setting movement, a furtherset of wipers arranged in driving connection with said drivingmechanism, said further set of wipers being adapted during the firstsetting movement of the first mentioned set of wipers to be set over afurther set of stationary contacts associated therewith in a. directionsubstantially coinciding with the direction of the second settingmovement of the first mentioned movable set of wipers.

2. A selector arrangement comprising a bank of contacts, a movable setof wipers cooperating with said bank of contacts and capable ofperforming setting movements in two perpendicular directions, a drivingmechanism for eifecting the rst setting movement, a further set ofwipers arranged in driving connection with said driving mechanism, saidfurther set of wipers being adapted during the rst setting movement ofthe rst mentioned setV of wipers to be set over a L further bank ofcontacts associated therewith in a direction substantially coincidingwith the direction of the second setting movement of the first mentionedmovable set of wipers, said last mentioned bank of contacts beingdesigned in V the same manner as the rst mentioned bank of contacts.

3. A selector arrangement comprising a bank of contacts, a movable setof wipers cooperating with said bank of contacts and capable ofperforming setting movements in two perpendicular directions, a drivingmechanism for effecting the first setting movement, a further set ofwipers arranged in driving connection with said driving mechanism, saidfurther set of wipers being adapted during the first setting movement ofthe rst mentioned set of wipers to be set over a further bank ofcontacts associated therewith in a direction substantially coincidingwith the direction of the second setting movement of the first mentionedmovable set of wipers, said last mentioned bank of contacts having adistance between its contacts equal to the distance between the contactsin the rst mentioned bank of contacts.

4. A selector arrangement comprising a set of stationary contactsconsisting of blank wires, a movable set of wipers cooperating with saidstationary contacts and capable of performing setting movements intwoperpendicular directions,

a driving mechanism for effecting the rst setting movement, a furtherset of wipers arranged in driving connection with said drivingmechanism, said further set of Wipers being adapted during the rstsetting movement of the irst mentioned set of wipers to be set over afurther set of stationary contacts consisting of blank Wires associatedtherewith in a direction substantially coinciding with the direction ofthe second setting movement of the rst mentioned movable set of wipers.

5. A selector arrangement comprising a set of stationary contacts, amovable set of wipers cooperating with said stationary contacts andcapable of performing setting movements in two perpendicular directions,a tube or rod designed as a rock and supporting a wiper holder whichcarries said set of Wipers, said tube being capable of performing axialdisplacement, a driving gear wheel cooperating with said rod performingsaid axial displacement, a further wiper holder formed as a rack for afurther set of wipers cooperating with a further set of stationarycontacts, a

further gear wheel which is co-axial with and rigidly connected to thefirst mentioned driving gear Wheel and adapted to drive said wiperholder.

6. An arrangement for step by step driven selectors comprising a bank ofcontacts, a movable set of Wipers cooperating with said contacts andcapable of performing setting movements in two perpendicular directions,a tube or rod designed as a rack and supporting a wiper holder whichcarries said set of Wipers, said tube being capable of performing axialdisplacement, a stepping mechanism for effecting said axial displacementof said tube or rod, a further set of Wipers being adapted during therst setting movements of the rst mentioned set of wipers to beset over abank of contacts associated therewith in a. direction whichsubstantially coincides with the direction of the second settingmovement of the i'lrst mentioned movable set of wipers, said steppingmechanism also effecting the advance of said further set of Wipers.

DAVID LAURENTIUS LIENZN.

